Also, CNN's New York bureau in the Time Warner Center was evacuated after a suspicious package was discovered in the building.

CNN, citing a law enforcement official, was initially told a suspicious package containing a pipe bomb that was addressed to the White House was intercepted at Joint Base Bolling in Washington, DC. The Secret Service, however, later said it had only intercepted the two packages intended for Obama and Clinton and called reports of a package headed for the White House "incorrect."

The law enforcement official said the devices intended for Obama and Clinton appear to be rudimentary but functional and similar to the ones sent to the home of billionaire investor and major Democratic donor George Soros, which was discovered earlier this week.

Also on Wednesday morning, the New York Police Department responded to a suspicious device discovered in the Time Warner Center in New York City, where CNN has a bureau. It was not immediately clear who the package was addressed to, but CNN evacuated its newsroom as a precaution.

Earlier Wednesday morning, the United States Secret Service said it had intercepted two "suspicious packages" addressed to Obama and Clinton, the 2016 Democratic presidential nominee, earlier this week.

Neither Obama nor Clinton received the packages or were at risk of receiving them, the Secret Service said. They were discovered during "routine mail screening procedures as potential explosive devices and were appropriately handled as such," the agency said in a statement.